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Larry King to guest on '30 Rock'

By April MacIntyre Nov 28, 2008, 19:06 GMT

Rocking some really big thumbs: Larry King - on NBC\'s 30 Rock © Lee Roth / RothStock / PR Photos

CNN host Larry King is the hardest working septuagenarian in show business.

He is the latest announced guest star to appear on Tina Fey's "30 Rock" for NBC.

TV Week's Josef Adalian reports that King's casting was confirmed. Reportedly Larry will play himself in a scene with series' star Tracy Morgan.

Adalian reports that King's scene "was shot on the set of Mr. King's CNN talk show."

Past "30 Rock" guest stars have included Tim Conway, Jennifer Aniston, Oprah Winfrey and Steve Martin.

King is a veteran of radio and television, and has appeared in numerous films and television shows as himself.